Smallest possible fission generator?

[Flyndaran]

Originally Posted by ericbsmith

To create a fission reactor all you really need are a couple pounds of processed fissionables. Everything else a reactor is made out of is to regulate the reaction, cool the reactor, get useful energy out of the reactor, and shield everyone from the radiation. Depending on how willing you are to let safety slide there's a lot of weight in a fission reactor that can be removed. At higher TLs the entire regulation process and energy extraction may be able to able to be miniaturized considerably. Shielding, unfortunately, can't really be improved without TL^ superscience - but it can be ignored.

Still amazing what a hypothetical society vaguely akin to Fallout could realistically achieve.
Don't go into the server room if you're not a nerd, and don't go into the reactor room if you want to live.
Meme: Super simple stuff